Adjustment Of Main Landing Gear - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
4.
Install the pivot bolt and tighten so the hook will rotate freely, yet without side play.
c.
Attach the uplock rod or cable (14) with the proper end attached to the hook (11) and the other end
to the crank fitting (21).
d.
To install the main gear housing assembly, position the gear so that the attachment points on the
housing align with the attachment plates (37 forward). If needed. install spacer washers between attachments
to allow a minimum amount of end play. Tighten nut on each pivot bolt to a snug fit. allowing the gear to
swing free. and safety.
e.
The upper and lower side brace link assembly may be installed by the following procedure:
I.
Install the forward upper link pivot tube attachment fitting (29) to the spar and secure with
cap bolts.
2.
Slide the pivot shaft (28) through the attachment plate (27) and into the attachment fitting (29).
Secure the pivot shaft to the attachment fitting.
3.
Ascertain that the forward upper arm (26) is installed on the link (31). Install the link (31)
on the pivot shaft and secure with washers and nut.
4.
The aft upper drag link (36) may be installed by sliding the link on the aft attachment plate
pivot bolt. Tighten the nut to allow the link to swing free with no side play and safety.
5.
Position the lower link (35) between the upper drag link ends. install bolt assembly and
tighten to allow the link to turn free with no side play.
6.
Attach the lower drag link (35) to the landing gear housing (40). secure and safety. Move
the gear in and out of the downlock position several times to determine that there is no binding.
f.
Position the downlock switch bracket (33) between the forward and aft upper drag links and bolt
in place.
g.
The downlock hook (34) may be installed on the drag link assembly by the following procedure:
1.
Place the "U" end of the downlock spring (68) over the back of the hook (34) with the loops
also toward the back.
2.
Spread the spring and fit the loops over the bushing that goes through the hook.
3.
Insert the ends of the spring into holes located in the downlock switch bracket (33) on each
side of the drag link assembly. Push the hook down between the two upper drag links until the bolt holes in
the links align with the bushing hole of the hook.
4.
Insert the pivot bolt and on each side of the bushing install spacer washers to maintain a
minimum amount of side play. Secure bolt and safety.
h.
The downlock cable or rod (23) may be installed by bolting the proper end of the rod or cable to the
downlock hook and the other end to the upper drag link arm, at the same time attaching the landing gear
actuating cylinder (15), also install anti-rotation clip. (See Sketch B of Figure 7-9.)
i.
Lubricate the landing gear assembly. (Refer to Lubrication, Section II.)
j.
Check the main gear adjustment, operation and alignment.
7-25. ADJUSTMENT OF MAIN LANDING GEAR. (Refer to Figure 7-9.)
a.
With the airplane on jacks and the gear extended, disconnect the inboard and outboard gear door
operating rods and keep the doors in the open position.
b.
Disconnect the downlock operating rod or cable (23) from the downlock hook (34).
c.
The through center adjustment of the side brace links is accomplished as follows:
I.
Maintain the gear in the downlocked position and both stop surfaces of the side brace links
touching.
2.
Ascertain that the linkage is 0.063 to 0.156 of an inch through center.
3.
If one side of the stop surfaces does not touch. it can be filed to obtain the desired through
travel.
4.
If filing brings the through travel beyond the 0.156 inch tolerance then a link or links must
be replaced.
Revised: 3/5/84
2E13
LANDING GEAR AND BRAKE SYSTEM
2E13